Initial Commit

3 files changed, 1028 insertions, 0 deletions

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diff --git a/contact-service/Cargo.toml b/contact-service/Cargo.toml
new file mode 100644
index 0000000..b06ac33
--- /dev/null
+++ b/contact-service/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "contact-service"
+version = "0.1.0"
+edition = "2021"
+license = "AGPL-3.0-or-later"
+
+[dependencies]
+axum = "0.8"
+tokio = { version = "1", features = ["full"] }
+serde = { version = "1", features = ["derive"] }
+chrono = "0.4"
diff --git a/contact-service/src/main.rs b/contact-service/src/main.rs
new file mode 100644
index 0000000..b83bbb8
--- /dev/null
+++ b/contact-service/src/main.rs
@@ -0,0 +1,215 @@
+// Copyright (C) 2026 Doan Luu Duc Tai <doan@luuduct.ai>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as
+// published by the Free Software Foundation, either version 3 of the
+// License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+use axum::{
+    extract::{Form, State},
+    response::Html,
+    routing::post,
+    Router,
+};
+use chrono::Utc;
+use serde::Deserialize;
+use std::io::Write;
+use std::path::PathBuf;
+use std::process::{Command, Stdio};
+use std::sync::Arc;
+
+#[derive(Clone)]
+struct AppConfig {
+    bind_addr: String,
+    cert_path: PathBuf,
+    inbox_dir: PathBuf,
+    sq_bin: PathBuf,
+}
+
+impl AppConfig {
+    fn from_env() -> Self {
+        let home = std::env::var("HOME").unwrap_or_else(|_| "/home/ops".into());
+
+        Self {
+            bind_addr: std::env::var("BIND_ADDR").unwrap_or_else(|_| "0.0.0.0:8085".into()),
+            cert_path: PathBuf::from(
+                std::env::var("CERT_PATH")
+                    .unwrap_or_else(|_| format!("{}/stack/contact-cert.pgp", home)),
+            ),
+            inbox_dir: PathBuf::from(
+                std::env::var("INBOX_DIR")
+                    .unwrap_or_else(|_| format!("{}/stack/inbox", home)),
+            ),
+            sq_bin: PathBuf::from(
+                std::env::var("SQ_BIN")
+                    .unwrap_or_else(|_| format!("{}/.cargo/bin/sq", home)),
+            ),
+        }
+    }
+}
+
+#[derive(Deserialize)]
+struct ContactForm {
+    sender: Option<String>,
+    message: String,
+}
+
+#[tokio::main]
+async fn main() {
+    let config = Arc::new(AppConfig::from_env());
+
+    let app = Router::new()
+        .route("/send-message", post(handle_message))
+        .with_state(config.clone());
+
+    let listener = tokio::net::TcpListener::bind(&config.bind_addr)
+        .await
+        .unwrap_or_else(|_| panic!("Failed to bind to {}", config.bind_addr));
+
+    println!("Contact backend listening on http://{}", config.bind_addr);
+    println!("Using PQC Cert: {:?}", config.cert_path);
+    println!("Storing inbox in: {:?}", config.inbox_dir);
+
+    axum::serve(listener, app).await.unwrap();
+}
+
+async fn handle_message(
+    State(config): State<Arc<AppConfig>>,
+    Form(form): Form<ContactForm>,
+) -> Html<&'static str> {
+    let message = form.message.trim();
+    if message.is_empty() {
+        return Html(ERROR_PAGE);
+    }
+
+    let raw_sender = form.sender.as_deref().unwrap_or("").trim();
+    let sender_display = if raw_sender.is_empty() {
+        "Anonymous"
+    } else {
+        raw_sender
+    };
+
+    let now = Utc::now();
+    let timestamp_str = now.format("%Y-%m-%d_%H-%M-%S").to_string();
+
+    let sanitized_sender: String = raw_sender
+        .chars()
+        .filter(|c| c.is_ascii_alphanumeric() || *c == '-' || *c == '_')
+        .take(30)
+        .collect();
+
+    let filename = if sanitized_sender.is_empty() {
+        format!("{}.pgp", timestamp_str)
+    } else {
+        format!("{}_{}.pgp", timestamp_str, sanitized_sender)
+    };
+
+    let output_path = config.inbox_dir.join(filename);
+
+    let payload = format!(
+        "=== RFC 9980 PQC MESSAGE ===\nSender:    {}\nTimestamp: {}\n============================\n\n{}",
+        sender_display,
+        now.to_rfc3339(),
+        message
+    );
+
+    let mut child = match Command::new(&config.sq_bin)
+        .args([
+            "encrypt",
+            "--for-file",
+            config.cert_path.to_str().unwrap_or_default(),
+            "--without-signature",
+        ])
+        .stdin(Stdio::piped())
+        .stdout(Stdio::piped())
+        .spawn()
+    {
+        Ok(proc) => proc,
+        Err(e) => {
+            eprintln!("Failed to spawn sq binary ({:?}): {}", config.sq_bin, e);
+            return Html(ERROR_PAGE);
+        }
+    };
+
+    if let Some(mut stdin) = child.stdin.take() {
+        if stdin.write_all(payload.as_bytes()).is_err() {
+            return Html(ERROR_PAGE);
+        }
+    }
+
+    let output = match child.wait_with_output() {
+        Ok(out) => out,
+        Err(_) => return Html(ERROR_PAGE),
+    };
+
+    if !output.status.success() {
+        eprintln!(
+            "sq encryption failed: {}",
+            String::from_utf8_lossy(&output.stderr)
+        );
+        return Html(ERROR_PAGE);
+    }
+
+    if std::fs::write(&output_path, &output.stdout).is_err() {
+        eprintln!("Failed to write to file {:?}", output_path);
+        return Html(ERROR_PAGE);
+    }
+
+    Html(SUCCESS_PAGE)
+}
+
+const SUCCESS_PAGE: &str = r#"<!doctype html>
+<html lang="en">
+<head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width,initial-scale=1">
+    <title>Message Sent - Doan Luu Duc Tai</title>
+    <link rel="stylesheet" href="/styles.css">
+</head>
+<body>
+    <div id="page">
+        <div class="badge">[ JS-free ]</div>
+        <div id="content">
+            <pre>
+<a href="/" class="logo">
+ ____   ___    _    _   _
+|  _ \ / _ \  / \  | \ | |
+| | | | | | |/ _ \ |  \| |
+| |_| | |_| / ___ \| |\  |
+|____/ \___/_/   \_\_| \_| LUU DUC TAI
+</a>
+
++------------------------------------------------------------------------------+
+| [+] Success: Message encrypted and delivered to inbox.                       |
++------------------------------------------------------------------------------+
+
+<a href="/"><-- Return to Home Page</a>
+            </pre>
+        </div>
+    </div>
+</body>
+</html>"#;
+
+const ERROR_PAGE: &str = r#"<!doctype html>
+<html lang="en">
+<head>
+    <meta charset="utf-8">
+    <title>Error</title>
+    <link rel="stylesheet" href="/styles.css">
+</head>
+<body>
+    <pre>
+[!] Error: Unable to process or encrypt message.
+
+<a href="/message.html"><-- Try Again</a>
+    </pre>
+</body>
+</html>"#;